Abstract

Calculations and measurements were made for studying the effect of partially transparent plates in order to increase contrast. It was shown that, aside from their present use for images on photographic film, these plates may be used for increasing the contrast of paper images. The differences in contrast on low density areas of images on paper and film may be considerably increased without significantly influencing the contrast ratios of high density areas. The increase in contrast in all cases results in a loss of the illuminating light energy and in some degradation of resolution.

© 1966 Optical Society of America

Rotating Prism Design for Continuous Image Compensation Cameras

J. H. Waddell
Appl. Opt. 5(7) 1211-1223 (1966)

A Spectrum Matching Technique for Enhancing Image Contrast

Donald S. Lowe and John G. N. Braithwaite
Appl. Opt. 5(6) 893-898 (1966)

Aerial Photography of the Earth’s Surface; its Procurement and Use

Robert N. Colwell
Appl. Opt. 5(6) 883-892 (1966)

Optical Properties and Applications of Photochromic Glass

G. K. Megla
Appl. Opt. 5(6) 945-960 (1966)

Surface-Deformation Measurement Using the Wavefront Reconstruction Technique

K. A. Haines and B. P. Hildebrand
Appl. Opt. 5(4) 595-602 (1966)